[ARROW-5102] [C++] Reduce header dependencies

• Type: Wish
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.13.0
• Fix Version/s: 0.14.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/21589
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 03/Apr/19 08:53
• Updated: 11/Jan/23 07:38
• Resolved: 18/May/19 15:38

Description

To tame C++ compile times, we should try to reduce the number of heavy dependencies in our .h files.

Two possible avenues come to mind:

• avoid including `unordered_map` and friends
• avoid including C++ stream libraries (such as `iostream`, `ios`, `sstream`...)

Unfortunately we're currently including `sstream` in `status.h` for some template APIs. We may move those to a separate include file (e.g. `status-builder.h`).

Issue Links

• links to: GitHub Pull Request #4313